code: def initialize_root(self, x):
      self.isroot = True
  
file_path: autograd/examples/dot_graph.py
imports: from __future__ import print_function
  import autograd.numpy
  from autograd.tracer import trace, Node
  from autograd import grad
label_desc: Use image node_id 2 for calling the GraphNode obj's underlying member method code with example usage: obj.initialize_root(x) without return types